Why is your cabinets are mostly loaded with 10 and 15 inch speakers where guitar cabs are mostly 12 inchers?

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Guitar players use 12's because 'famous dead guys' always used 12's in their Marshalls and they want the same kinds of distortion. Bass players use whatever tends to have the best engineering for their needs and are avoiding distortion for the most part. Guitar speakers need to handle 25-75w, while bass speakers are about 10x that.

There are plenty of good 12's being used in bass now, but there was a period (1970-1990) where few 12" cabs were being made for bass. Style as much as anything I suppose.

"Guitar players use 12's because 'famous dead guys' always used 12's in their Marshalls and they want the same kinds of distortion. Bass players use whatever tends to have the best engineering for their needs and are avoiding distortion for the most part. "

Good observation. Guitarists like distortion. Bassists like clean. It's usually what sounds the best together

I've been listening to alot of music lately looking for examples of bass distortion. Other than heavy metal/rock you won't find much distortion in bass.